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, G. A. GRENVILLE.

SASH HOLDER.

No. 317,121. Patented May .5, 1885.

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UNITED STATES PATENT OFFICE.

GEORGE A. GRENVILLE, or KINGSVILLE, ONTARIO, CANADA.

SASH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 317,121, dated May 5, 1885.

Application filed January 14, 1885. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. GRENVILLE, of Kingsville, in the county of Essex and Dominion of Canada, have invented new and useful Improvements in Window-Sash Attachments; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to an improvement in devices for balancing windowsashes, so that when raised or lowered to any desired height they will stay in their adjusted position.

The improvement consists in the peculiar combinations and the construction and arrangement of parts hereinafter more fully-described and claimed.

In the drawings which accompany this specifioation, Figurel is a horizontal cross-section through a 'window, showing my device in place. Fig. 2 is a perspective view showing my lmproved friction sash-balance detached fromthe recess in the window-sash.

A 1s a window-sash, and B is the windowainb, both of the usual construction.

.0 1s a leaf-spring, preferably curved as shown D D are two rubber-faced rollers, secured to the ends of the leaf-spring in any sultable way so that they are freeto roll. In the drawings the leaf-spring is shown bifurcated at each end,and a rivet is driven throughthe blfurcated ends to secure the rollers in place. E is asuitable recess in the edge of the sash, 1n which the device can be loosely inserted, and F is a thumb-screw passing through the sash from the inside and engaging into a nut, G, which is centrally secured at the bottom of the recess E.

In practice the parts are so arranged th at the end of the thumb-screw furnishes a central fulcrum for the leaf-spring,allowing the rollers to project sufficiently from the recess to'impinge against the adjacent inner face of the jamb, and if sufficient tension is given to the leaf-spring by means of thumb screw the friction of A the rollers against the jamb can be so regulated as to hold the window-sash in position against its gravity.

I prefer to provide dow-sash with this friction device, and if one is not sufficient two or more may be used for each stile.

It is preferable to provide the leaf-spring in the center with a small hole or indentation,

pering end of the screw F, will hold the leafspring against accidental displacement.

Instead of the thumbscrew F,a fulcrum of but preferably such a fulcrum which admits of adjusting the tension of the leaf-spring.

both stiles of each win- G, which, in connection with a reduced or tal\ The device herein described will be found to keep always in good working order, and the effort required to raise or lower the window-sash is, on account of the rolling nature of the friction, but little.. It is inexpensive and can be readily applied to any window.

I am aware of the Patents Nos. 5,505 and 84,088, and make no claim to the constructions shown therein asforming part of my invention.

I deem it important that the end of the set-- screw F pass through the center of the leaf, as

shown, for by this construction no other means are required to retain the spring in place against displacement. The set-screw thus serves the double function of holding the y spring in place and, in connection with the nut G, regulating the tension of said spring.

WVhat I claim as my invention is An attachment for a window-sash,consisting of a leaf-spring carrying at its two ends flexible wheels or rollers, in combination with a set-screw whose end passes through the center of the leaf-spring, whereby the tension of the spring is regulated and the spring held in its position in the sash, substantially as and for the purposes set forth.

I WVitnesses:

H. S. SPRAGUE,

E. J. ScULLY.

GEO. A. GRENVILLE.

6o any other kind may be used for the leafspring, 

